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path: root/drivers/scsi/qla2xxx/qla_dfs.c
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Diffstat (limited to 'drivers/scsi/qla2xxx/qla_dfs.c')
-rw-r--r--drivers/scsi/qla2xxx/qla_dfs.c175
1 files changed, 175 insertions, 0 deletions
diff --git a/drivers/scsi/qla2xxx/qla_dfs.c b/drivers/scsi/qla2xxx/qla_dfs.c
new file mode 100644
index 000000000000..1479c60441c8
--- /dev/null
+++ b/drivers/scsi/qla2xxx/qla_dfs.c
@@ -0,0 +1,175 @@
+/*
+ * QLogic Fibre Channel HBA Driver
+ * Copyright (c) 2003-2005 QLogic Corporation
+ *
+ * See LICENSE.qla2xxx for copyright and licensing details.
+ */
+#include "qla_def.h"
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+static struct dentry *qla2x00_dfs_root;
+static atomic_t qla2x00_dfs_root_count;
+
+static int
+qla2x00_dfs_fce_show(struct seq_file *s, void *unused)
+{
+ scsi_qla_host_t *ha = s->private;
+ uint32_t cnt;
+ uint32_t *fce;
+ uint64_t fce_start;
+
+ mutex_lock(&ha->fce_mutex);
+
+ seq_printf(s, "FCE Trace Buffer\n");
+ seq_printf(s, "In Pointer = %llx\n\n", ha->fce_wr);
+ seq_printf(s, "Base = %llx\n\n", (unsigned long long) ha->fce_dma);
+ seq_printf(s, "FCE Enable Registers\n");
+ seq_printf(s, "%08x %08x %08x %08x %08x %08x\n",
+ ha->fce_mb[0], ha->fce_mb[2], ha->fce_mb[3], ha->fce_mb[4],
+ ha->fce_mb[5], ha->fce_mb[6]);
+
+ fce = (uint32_t *) ha->fce;
+ fce_start = (unsigned long long) ha->fce_dma;
+ for (cnt = 0; cnt < fce_calc_size(ha->fce_bufs) / 4; cnt++) {
+ if (cnt % 8 == 0)
+ seq_printf(s, "\n%llx: ",
+ (unsigned long long)((cnt * 4) + fce_start));
+ else
+ seq_printf(s, " ");
+ seq_printf(s, "%08x", *fce++);
+ }
+
+ seq_printf(s, "\nEnd\n");
+
+ mutex_unlock(&ha->fce_mutex);
+
+ return 0;
+}
+
+static int
+qla2x00_dfs_fce_open(struct inode *inode, struct file *file)
+{
+ scsi_qla_host_t *ha = inode->i_private;
+ int rval;
+
+ if (!ha->flags.fce_enabled)
+ goto out;
+
+ mutex_lock(&ha->fce_mutex);
+
+ /* Pause tracing to flush FCE buffers. */
+ rval = qla2x00_disable_fce_trace(ha, &ha->fce_wr, &ha->fce_rd);
+ if (rval)
+ qla_printk(KERN_WARNING, ha,
+ "DebugFS: Unable to disable FCE (%d).\n", rval);
+
+ ha->flags.fce_enabled = 0;
+
+ mutex_unlock(&ha->fce_mutex);
+out:
+ return single_open(file, qla2x00_dfs_fce_show, ha);
+}
+
+static int
+qla2x00_dfs_fce_release(struct inode *inode, struct file *file)
+{
+ scsi_qla_host_t *ha = inode->i_private;
+ int rval;
+
+ if (ha->flags.fce_enabled)
+ goto out;
+
+ mutex_lock(&ha->fce_mutex);
+
+ /* Re-enable FCE tracing. */
+ ha->flags.fce_enabled = 1;
+ memset(ha->fce, 0, fce_calc_size(ha->fce_bufs));
+ rval = qla2x00_enable_fce_trace(ha, ha->fce_dma, ha->fce_bufs,
+ ha->fce_mb, &ha->fce_bufs);
+ if (rval) {
+ qla_printk(KERN_WARNING, ha,
+ "DebugFS: Unable to reinitialize FCE (%d).\n", rval);
+ ha->flags.fce_enabled = 0;
+ }
+
+ mutex_unlock(&ha->fce_mutex);
+out:
+ return single_release(inode, file);
+}
+
+static const struct file_operations dfs_fce_ops = {
+ .open = qla2x00_dfs_fce_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = qla2x00_dfs_fce_release,
+};
+
+int
+qla2x00_dfs_setup(scsi_qla_host_t *ha)
+{
+ if (!IS_QLA25XX(ha))
+ goto out;
+ if (!ha->fce)
+ goto out;
+
+ if (qla2x00_dfs_root)
+ goto create_dir;
+
+ atomic_set(&qla2x00_dfs_root_count, 0);
+ qla2x00_dfs_root = debugfs_create_dir(QLA2XXX_DRIVER_NAME, NULL);
+ if (!qla2x00_dfs_root) {
+ qla_printk(KERN_NOTICE, ha,
+ "DebugFS: Unable to create root directory.\n");
+ goto out;
+ }
+
+create_dir:
+ if (ha->dfs_dir)
+ goto create_nodes;
+
+ mutex_init(&ha->fce_mutex);
+ ha->dfs_dir = debugfs_create_dir(ha->host_str, qla2x00_dfs_root);
+ if (!ha->dfs_dir) {
+ qla_printk(KERN_NOTICE, ha,
+ "DebugFS: Unable to create ha directory.\n");
+ goto out;
+ }
+
+ atomic_inc(&qla2x00_dfs_root_count);
+
+create_nodes:
+ ha->dfs_fce = debugfs_create_file("fce", S_IRUSR, ha->dfs_dir, ha,
+ &dfs_fce_ops);
+ if (!ha->dfs_fce) {
+ qla_printk(KERN_NOTICE, ha,
+ "DebugFS: Unable to fce node.\n");
+ goto out;
+ }
+out:
+ return 0;
+}
+
+int
+qla2x00_dfs_remove(scsi_qla_host_t *ha)
+{
+ if (ha->dfs_fce) {
+ debugfs_remove(ha->dfs_fce);
+ ha->dfs_fce = NULL;
+ }
+
+ if (ha->dfs_dir) {
+ debugfs_remove(ha->dfs_dir);
+ ha->dfs_dir = NULL;
+ atomic_dec(&qla2x00_dfs_root_count);
+ }
+
+ if (atomic_read(&qla2x00_dfs_root_count) == 0 &&
+ qla2x00_dfs_root) {
+ debugfs_remove(qla2x00_dfs_root);
+ qla2x00_dfs_root = NULL;
+ }
+
+ return 0;
+}